T60: set dock LED's in mainboard.c

T60: set dock LED's in mainboard.c

The docking takes place in romstage to have early serial I/O for debugging.
But to keep romstage small and prevent linking the EC code to romstage, set the
status LED's in ramstage.

Change-Id: I89fadbd61b6bfd9aff8c22370e51c84325f24751
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Reviewed-on: http://review.coreboot.org/42
Tested-by: build bot (Jenkins)